Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-01-23
Phys.Rev.D77:054026,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 9 tables, 1 section added (mixing angles), minor changes in the abstract and the conclusions, to be published in Phy
Scientific paper
10.1103/PhysRevD.77.054026
Much work has been devoted to the study of nonstrange baryons belonging to the $[\textbf{70},1^-]$ multiplet in the framework of the $1/N_c$ expansion. Using group theoretical arguments here we examine the relation between the exact wave function and the approximate one, customarily used in applications where the system is separated into a ground state core and an excited quark. We show that the exact and approximate wave functions globally give similar results for all of mass operators presented in this work. However we find that the inclusion of operators acting separately on the core and on the excited quark deteriorates the fit and leads to unsatisfactory values for the coefficients which encode the quark dynamics. Much better results are obtained when we include operators acting on the whole system, both for the exact and the approximate wave function.
Matagne Nicolas
Stancu Fl.
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